5

Fermented...:
Many fibers, particularly the water insoluble kind, are readily fermented by your gut flora. Some people have certain intolerances to bean husks (try beano), to wheat/barley/rye (gluten sensitivity), &/or have a particularly active population in their gut of gas-forming organisms (try bifidobacter-containing probiotics). Maybe altered GI motility, ibs, air swallowing, maldigestion/malabsorption?
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6

Gas:
Peanuts like beans, belong to the legume family, which can produce gas in some people. Other nuts, to my knowledge, do not since they are not legumes. Beano contains an enzyme that dels with the component of peanuts & beans that causes the gas; take before eating them.
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7

No, usually not:
Grapes are fruit, with juice and sugar, so they don't tend to cause constipation. Eating too much fruit might cause the loose stools. The main problem in constipation is that the time it takes for food one ate to go through the intestine and out the anus is too long of a time. One must make "intestinal transit" time more rapid. Water plus fiber helps, but sometimes laxatives are needed.
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11

Possibly:
Lettuce can contribute to fibre in diet and hence roughage....meaning bulk in the stools. This can retain stools and bloat you.
Regular BMs is the best solution to decrease gas. Simethicone can help reduce gas .
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17

Flatulence problem?:
Flatulence neither localizes your problem to small or large bowel, nor indicates severity or cause. You have described a gut that may be dysfunctional due to infection, sibo, motility problems, inflammation, ibs, ischemic disease, maldigestion, sphincter problem, or food intolerance. If the latter check low fod-mapdiet restrictions: stanfordhospital.Org/.../nutrition/dh-low-fodmap-diet-handout.Pdf.
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